delany



(No Model.)

P. B. DELANY.

8 8 TBLEGRAPHY. No. 388,481.

Patentedv Aug. l288,-1888.

N. PETERS Phmrmnognplnr. wamIngtamQEG UNITED STATES PATENT OFFICE.

PATRICK B. DELANY, OF NEV YORK, N, Y.

TELEGRAPHY.

SPECIFICATION forming part of Letters Patent N o. 388,481, dated August28, 1888.

To @ZZ-whom, it may concern:

Be it known that I, PATRICK B. DELANY, of New York city, State of NewYork, United States of America, have invented certain new and usefulImprovements in Telegraphy, of which the following is a specification.

In two Letters Patent granted me November 29, 1887, I have shown asystem of telegraphy of the same character as that herein disclosed. Inthose patents two ways of neutralizing or eliminating static andretarded currents from the line are illustrated, one by grounding themainline at each station after each impulse, 'and another by the use ofcondensers at the ends of the line. In the pres ent case I cause thetransmitted impulse upon its reception to operate apparatus which throwsa counter-currenton the line from any suitable source-for instance, froman ordinary primary battery. The apparatus by which this is accomplishedis novel, and I do not limit its use to sending neutralizing or countercurrents into the line after each interruption of the circuit, thoughthat is the primary purpose for which I have invented it.

The accompanying drawing is a diagram illustrating my invention, andshowing two connected stations with the transmitting apparatus switchedin at station X, and the re ceiving apparatus at station Y.

The transmitting apparatus at X is identical with that shown in mypatent of November 29, 1887, No. 373,968-that is to say, by themanipulation of the key K the trailer k is caused totravel over thecontacts a b, which are arranged alternately, and are respectivelyconnected with opposite poles of a source of electric energy, and pauseupon intermediate contacts, c, after being depressed or raised, wherebyimpulses of alternating polarity but equal duration are sent into theline. A condenser, Cd, connected between the earth and the intermediatecontacts sends counter currents into the line, as described in saidpatent, the condenser being charged by the bridging of the trailer fromthe contacts a b to the intermediate contacts, c. A polarized relayp r,may be placed between the earth and condenser, if desired, to indicatebreaks from the receiving-station. The receiver at station Y has atrailer or contact-maker and a table of contacts, the alternate largecontacts ef of (No model.)

which are respectively connected with opposite poles of a battery, C B,having its center to ground through an adjustable resistance, Theintermediate small contacts, g, are all connected to earth through apolarized relay, P B, the armature of which controls the local of apolarized sounder, P S, whose armature is forked at the end and acts ona star-wheel on the spindle ofthe trailer or contact maker. At theperiods of rest of the sounder-armature the trailer pauses upon anintermediate contact, g, as shown.

The operation is as follows: Assuming the key at X is depressed,apositive current (indicated by the full arrows) is sent over the line asthe trailer crosses a battery-contact, a. At Y this impulse, acting onthe relay P R, drives its armature to the left, thus actuating thepolarized sounder P S and causing its armature acting through thestar-wheel and spindle to move the trailer acrossa large segment, i

e, connected with the positive pole of the battery C B. Upon thecessation of the batterycurrent transmitted, as described, from X to Y,the retarded current or static discharge'(in dicated by the dottedarrows) commences to iiow out of each end of the line. At thetransmitter end it is neutralized by the condenserdischarge, as abovementioned, and at the receiving end by the impulse sent from the batteryC B, asjust described, the neutralizingcurrents being indicated by thewavy arrow. By adjusting the resistance between the battery C Bandground, the power of the neutralizing impulse sent into the line fromthe battery may be regulated. Upon the raising of the transmitting-keyat X a negative message impulse is sent into the line from the contactb, and the static discharge or retarded current from such impulse at thereceiving end is neutralized by a negative impulse from battery C B,which is sent into the line when the armature of the polarized relay isdriven over to its right-hand contact and the trailer caused to passover a negative segment, f..

I do not limit myself to the particular manner of operating the traileror the particular IOO e" esami mitting mechanism for sending alternatingcurrents over the line, a receiving polarized relay, a movingcontact-maker connected with the line, its actuating mechanismcontrolled by the relay, and contacts c j' respectively connected withsources of energy of opposite polarity, over one of which contacts thetrailer passes at each movement ot' the relay-arma ture, whereby acounter-current is sent into the line after each received impulse.

2. The combination, with a main line and current -transmitting devices,of a receiver having a receiving-relay, contacts connected with sourcesofelectricity ofopposite polarity, and a contact-maker connected withthe line and controlled by the relay, which contactmaker successivelycrosses said contacts as the relay is successively actuated.

3. The combination, with the main lincand transmitting devices forsending currents of alternating polarity, of a receiver having a trailerconnected with the line, a table of contacts traversed by thetrailer,and the alternate contacts ef of which are respectivelyconnected with opposite poles of a source ofelectric energy and theintermediate contacts on which the trailer normally rests connected toearth through the polarized relay, and the trailer-actuating devicescontrolled by the relay-armature.

4. The combination at a receiving station of the receiving-relayactuated by impulses received from the distant transmitting-station, thecontactmaker,Which moves in response to said received impulses,contact-maker-actuating devices controlled by the relay, a lineconnected with the contact-maker, the contacts e f,traversed bythecontact-maker,and asource of electric energy with which said contactsare respectively connected-and from which counter or neutralizingimpulses are sent into said line, as set forth.

5. The combination of a line,a relay located at a receiving-station andresponding to impulses received from the distant transmittingstationwith which relay the li ne is normally con nected,a contact-makerconnected with the line and moving in response to said receivedimpulses, contacts traversed by said contactmaker, thecontact-maker-actuating devices controlled by the relay, and a source ofelectric energy with which said contacts are respectively connected,whereby upon the reception of an electrical impulse upon the relay theline is Jarieliy connected with one of said battery-connected contacts,substantially as set forth.

6. The combination at a receiving-station ot' a receiving-relayactuating by impulses received from the distant transmitting-station, acontact-maker moving in response to said impulses, contact-maker-actuating devices con trolled by the relay, aline connected to thecontact-maker,alternate contacts traversed by t-he contactmaker, andsources of electric energy of opposite polarity with which` saidalternate contacts are respectively connected, whereby impulses are sentinto the line connected to the contact-maker as it passes over eachelectrically-connected contact.

In testimony whereof I have hereunto subscribed my name.

PATRICK B. DELANY.

Witnesses:

EDWARD C. DAVIDSON, FnANons M. GIDBs.

